Inventor

HERBERT NICHOLAS

2 patents

⚠️ This page may combine multiple inventors who share the name “HERBERT NICHOLAS”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KOPPERS CO INC

1 patent

US4176434ADec 4, 1979

Method of making piston rings with chrome-filled grooves

KOPPERS CO INC16 citations69

CROMWELL JOHN E

1 patent

US4307890ADec 29, 1981

Piston ring with chrome-filled groove

CROMWELL JOHN E17 citations65